18. A group of Industrial-Organizational psychologists wanted to test if giving a motivational speech at the end of a meeting would encourage office workers to have a higher output to their work based on the numbers of sales each worker made. The researchers used the same 10 participants in both conditions: first data were collected after a regular meeting with no speech, and later after a meeting ending with a motivational speech. Calculate the change in sales using T2 - T1. Here are the sales numbers for the 10 participants in both conditions. Use the four steps of hypothesis testing to find out if the motivational speechincreased sales using the appropriate t-test.

a. State the null and alternative hypotheses. Is it 1 tailed or 2?

b. Find the critical value for this t-test. Which tail is shaded?

c. Perform a related-samples t test.

d. Is there a significant mean difference across conditions? Test using an alpha level of .05. Write conclusion writing :(test used, significance, include IV and DV, APA stats and direction of any significant difference found.)

Motivational speech T2	No speech T1
4	2
5	1
8	4
7	9
2	0
11	9
9	2
3	3
4	7
10	3

18 Bonus. For two more HW points - enter these data and run the repeated-t test in JASP. Include descriptives and effect size d. Copy the significance table and descriptives Write the conclusion including the mean difference and the effect size d.